Arrector Pil : Each hair follicle has a tiny muscle called the arrector pili attached to it.
:每个发囊下面连着个很小肉叫做。
Arrector Pil : Each hair follicle has a tiny muscle called the arrector pili attached to it.
:每个发囊下面连着个很小肉叫做。
Arrector Pili are tiny muscles attached to the base of the hair follicles.
竖()是些附着在囊底小肉。
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